Characteristics of Patients with Recurrent Emergency Medical Services Utilization for Symptomatic Hypoglycemia in an Urban Setting

<b>Background</b>: Symptomatic hypoglycemia frequently results in utilization of emergency medical services (EMS). Understanding the characteristics of hypoglycemic patients with high EMS utilization may help providers optimize resource allocation. <b>Objective</b>: To describe characteristics of patients utilizing EMS for hypoglycemia and to determine if any factors identifiable in the prehospital setting are associated with recurrent EMS utilization. <b>Methods</b>: A retrospective chart review of prehospital care records from an urban EMS system was performed. Patients who received oral glucose, parenteral glucose, or intramuscular glucagon for hypoglycemia over a one-year period were identified. Extracted information included demographics, prehospital treatment, disposition, zip code median income, and the number of subsequent EMS utilizations within 365 days. <b>Results</b>: We identified 549 subjects, mean age 55 years (range 5 to 104, 65% male). The mean glucose level for all patients was 44 mg/dl with standard deviation (SD) of 15. In total, 69% of patients received oral glucose, 26% received parenteral glucose, 3% received glucagon, and 2% received more than one medication. At the index visit, 81% of patients accepted hospital transportation. The rate of recurrent EMS utilization for hypoglycemia was 10%, and 3% of patients had 3 or more repeat utilizations within 365 days. The mean finger-stick glucose at index visit was 39 mg/dL (SD 15) for patients with multiple EMS utilizations and 44 mg/dL (SD 14) for those with one EMS visit (P = 0.006). Repeat utilizers were more likely to have received medications other than oral glucose at index visit, 51% vs. 28% (P < 0.001). Age, gender, median zip code income, and disposition were not associated with recurrent EMS utilization. The overall annual rate of hypoglycemia requiring EMS treatment per estimated diabetic population was 0.84%. <b>Conclusion:</b> A low proportion of patients utilizing EMS for hypoglycemia had subsequent EMS visits within 365 days. Those who did had lower initial blood glucose at the index visit and were more likely to have received prehospital treatment with medications other than oral glucose. Demographic characteristics did not yield any patterns predictive of repeat utilization. Refusing transport to the hospital after EMS treatment for hypoglycemia did not increase the risk of recurrent utilization.